Tonight we have more clues in that ups plane crash, the one that narrowly missed those houses. Investigators retrieved the black boxes today. Abc's david kerley is at the crash site again for us tonight. Reporter: With the wreckage cooled, 24 hours after this dramatic and fiery crash of that big ups cargo jet, ntsb investigators found these, the airbus a 300 cockpit recorders. It was a priority today because it will tell us what the pilots were saying and doing with the aircraft. We should know tomorrow whether or not we have good data on the recorders. Reporter: A relative told the associate press that the co-pilot was 37-year-old shaning fanning. He was obviously too low. Reporter: That's cornelius benson who we met on his yard, a yard littered with debris from the plane that hit his trees. That's say heavy piece. If that hit your house, that would have done something to the roof. That's correct. Reporter: What's alarming is the rate of deadly crashes involving cargo jets. Earlier this year a 747 out of afghanistan crashed during takeoff when its load shifted. A study showed that in the past decade the fatal crash rate for cargo jets is 8 times that of passenger aircraft. Why? No conclusions but different rules apply to cargo pilots. They're allowed to fly longer hours. They also tend to fly at night more. Reporter: Tond those recorders may soon yield clues as to why this jet was too low. David kerley, abc news, birmingham.

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